We always have watermark in the process of using.Attached is our screenshot.Aspose Cells使用疑惑.pdf (294.3 KB)
Thank you for the screenshots.
It seems that the License class you are using in your code is not from com.aspose.cells.License. Instead, it may come from the Aspose.Words API or other APIs. Please create fully qualified namea when creating objects for the API classes (eg Aspose.Words, Aspose.Cells, etc.) that should solve your problem. You need to instantiate and create License class separately for each API.
If you still find any problem, please let us know.